Description

Add ability to pre-install JetBrains plugins in Coder workspaces via the plugins variable. This addresses the feature request in #208.

Uses a two-pronged approach:

1. Creates .idea/externalDependencies.xml so IDE prompts for missing plugins when project opens
2. Background installer monitors for IDE installation and auto-installs plugins via CLI

Type of Change

• New module
• New template
• Bug fix
• Feature/enhancement
• Documentation
• Other

Module Information

Path: registry/coder/modules/jetbrains
New version: Feature addition (minor bump recommended)
Breaking change: [ ] Yes [x] No

Testing & Validation

• Tests pass (bun test) - 7 E2E tests
• Tests pass (terraform test) - 24 Terraform tests (7 new)
• Code formatted (bun fmt)
• Changes tested locally

New Features

• plugins variable accepting list of JetBrains plugin IDs
• plugins output exposing configured plugins
• coder_script resource for plugin installation
• Documentation with usage examples and popular plugin IDs table

Related Issues

Closes #208

/claim #208